| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Ren wpada do Tybru | 978-83-61881-71-1 (83-61881-71-9) | 2011 |
| The Rhine Flows into the Tiber: A History of Vatican II | 978-0-89555-186-3 (0-89555-186-1) | 1967 |
M W · R. M. · Ralph M. · Ralph W. · Ralph Wiltgen · Wiltgen Ralph M.